drm/amd/display: fix dp kvm can't light up

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[why]
The DP KVM failed to light up, since the lttpr_mode is not reset to
default value when failed to read LTTPR capabilities, and the
variable max_link_rate retains a initial value zero, this cause variable
link_rate be assigned to an error value zero, consquently pixel_clock
get wrong value zero, and kvm can't light up.

[how]
Reset lttpr_mode to default value when failed to read LTTPR
capabilities, so that the link_rate fallbacks to the minimum rate that
supported by link encoder and sink.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Tianci.Yin <tianci.yin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Tianci.Yin 2022-03-08 13:45:45 +08:00 • committed by Alex Deucher

parent 8718ca1dbf

commit 2e9fda82c9

1 changed files with 1 additions and 0 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

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